While I can agree with Scarf on her argument, I do feel that there needs to be a good balance of all of the types, especially to give the competetive metagame more variety.

The only good ghost-type I've come across in OU/Standard is Jellicent, just because it's an annoying wall. I can say that ghost types should be given a buff in this generation to perform more effectively in competetive play. Then again, I do want Grass-types to have another buff and a lot more Fire-types in the field.